place where I can refund the order
to refund the order, go to the admin login->sales->orders-> open an order, you wish to refund, if the invoice is generated then refund button will be visible in this order page.
please explain the ordering process using PayPal in details?
if the payment is done using paypal and your project has been hosted on live server, then invoice will be generated automatically else you have to create it manually..
When I list orders, I see the status pending, but how do I know which ones are paid and which are not?
if the status is pending it's mean the payment is not done, if the payment is done then status will update to complete/processing stage.
What does invoice mean?
An invoice is a document issued by a seller/buyer that indicates the quantities and costs of the products or services provider by the seller, also it has a total summary of transaction that you have received/paid.
once the invoice generated your customer will get a receipt in their email.
so whole process is working as a real time scenario.
Please ask freely for any further queries.